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Article History

Received: 16 August 2021

Accepted: 20 January 2022

First Online: 31 January 2022

Declarations

:

: The study was planned and conducted in accordance with the principles of the Declaration of Helsinki, and the study protocol was approved by the Ethical Review Board of Tokyo Ariake University of Medical and Health Sciences (Project identification code: 256; date of approval: July 26, 2018). The requirement for informed consent was waived by the Ethics Committee of Tokyo Ariake University of Medical and Health Sciences because of the retrospective nature of the study and was not required for research that relied exclusively on secondary use of anonymous human biological materials as long as the process of data recording or dissemination of results does not generate identifiable information.

: Not applicable

: The authors declare that they have no competing interests.